JPS6222807Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a magnetic sensing element used in a magnetic compass that detects the direction of the earth's magnetic field by detecting the earth's magnetic field.

Detection of the direction of the earth's magnetic field is typically performed by determining the magnitudes of the X and Y components of the earth's magnetic field. The magnetic sensing element used at this time is constructed by applying an excitation winding and a detection winding to one or two orthogonal bar-shaped magnetic cores, or by applying an excitation winding to a ring-shaped magnetic core and adding a magnetic core. It was common to have a detection winding wrapped around the sensor.

In this case, the detection outputs of the individual magnetic sensing elements also vary due to variations in the magnetic material used for the magnetic core, variations in the manufacturing process when making the magnetic core, and the like. Further, even in a set of the same magnetic sensing elements, there is often a difference in the magnitude of the X component and the Y component. This was supposed to reduce the bearing accuracy of the compass.

To correct these variations in detection output, the amplification factor of the amplifier in the electric circuit and the number of turns of the detection winding are generally adjusted. However, there were limits to the adjustment that could be made using these methods, and there were also problems in terms of cost.

Therefore, an object of the present invention is to eliminate such problems and easily eliminate variations in the detection winding output, thereby providing a highly accurate and economical magnetic sensing element.

The present invention will be described below using embodiments with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of a magnetic sensing element according to the present invention. This magnetic sensing element includes an annular magnetic core 1 made of a highly permeable material.
An alternating current excitation winding 2 is uniformly wound around the magnetic core 1 to excite the core 1 sufficiently to achieve magnetic saturation.

The annular magnetic core 1 further includes a first detection winding composed of a pair of winding elements 3 and 3' symmetrical at an angle α with respect to a first reference line A that corresponds to the diameter of the magnetic core 1; A first reference line A that corresponds to the diameter of the magnetic core 1
A second detection winding consisting of a pair of winding elements 4 and 4' is assembled to surround the magnetic core 1 and is symmetrical at an angle α with respect to a second reference line B that is perpendicular to the second reference line B. It goes without saying that the pair of winding elements 3 and 3' or 4 and 4' are connected in series so that their outputs are the sum.

Each of the winding elements 3, 3', 4, 4' is applied to a plurality of winding frames 5 as shown in FIGS. 2 and 3 when assembled onto the magnetic core 1.
After winding, these winding frames 5 are fitted to the outside of the magnetic core 1 so as to pass through the center, and are rotatably attached to the center of a spacer 6 inside the magnetic core 1 using a central shaft 7. It is something that can be done. Connections between the winding elements can be made after the winding frame 5 has been installed.
It goes without saying that the winding frames 5 overlap in multiple layers along the central axis 7.

Furthermore, a movable slider 8 guided along a second reference line B is assembled to the spacer 6. As can be seen from FIGS. 4 and 5, this slider 8 has a dovetail groove 81 along the side surface of the winding frame 5 for the winding elements 4, 4' constituting the second detection winding. The dovetail 51 is engaged with the dovetail groove 81 by fitting into the dovetail groove 81. As a result, when the slider 8 is moved in the guided direction, that is, in the direction along the second reference line B, the angle of the winding frame 5 is changed accordingly. That is, the slider 8 serves as an angle adjustment device for adjusting the angle between the winding frames 5. In this way, as the angle of the winding frame 5 is adjusted, the angle α of the winding elements 4, 4' with respect to the second reference line B changes while maintaining a symmetrical angle. It goes without saying that a change in the angle α of the winding elements 4, 4' results in a variation in the output of the second detection winding. In this embodiment, the movement of the slider 8 is also guided by a dovetail fit between the slider 8 and the spacer 6, but other structures may be used.

Further, as shown in Fig. 6, two sliders 8 are provided so as to be movable along the first and second reference lines A and B, respectively, so that the outputs of the first and second detection windings can be individually controlled. It may be possible to adjust it to

For example, in a magnetic sensing element as shown in FIG. 7, where the angle α of the pair of winding elements 3, 3' constituting the first sensing winding with respect to the first reference line A becomes substantially zero. The output of the second detection winding can also be adjusted in a similar manner.

As explained above using the embodiments, according to the present invention, the detection winding assembled to the annular magnetic core can easily change the angle of the pair of winding elements that make up the detection winding. Since the output can be easily adjusted by changing the angle, it is possible to provide a high-precision magnetic sensing element with little variation at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the magnetic sensing element according to the present invention, FIG. 2 is a plan view with the winding omitted,
Fig. 3 is a central sectional view of Fig. 2, Fig. 4 is an end view cut along the line of Fig. 1, and Fig. 5 is a perspective view of only the main parts showing the engagement structure between the slider and the winding frame. figure,
FIG. 6 is a schematic diagram of another embodiment, and FIG. 7 is a schematic diagram of still another embodiment. DESCRIPTION OF SYMBOLS 1... Magnetic core, 2... Excitation winding, 3, 3'... Winding element constituting the first detection winding, 4, 4'...
Winding elements constituting the second detection winding, 5... winding frame, 6... spacer, 7... central axis, 8... slider, A... first reference line, B... second Reference line.

Claims (1)

[Claims for Utility Model Registration] 1. An annular magnetic core made of a high permeability magnetic material, an excitation winding wound around the magnetic core, and portions diametrically opposed from the outside at different positions of the annular magnetic core. a magnetic sensor, the first and second sensing windings having two winding elements connected in series with each other; In the element, first and second winding frames are rotatable along the magnetic core with the center of the annular magnetic core as a fulcrum, and a first winding frame that adjusts the angle between the first and second winding frames. and an angle adjustment device, wherein the two winding elements of the second detection winding are wound around the first and second winding frames in one-to-one correspondence. element. 2. In the magnetic sensing element according to claim 1 of the utility model registration, the third and fourth magnetic sensing elements are rotatable along the magnetic core with the center of the annular magnetic core as a fulcrum.
and a second angle adjustment device for adjusting the angle between the third and fourth winding frames;
A magnetic sensing element characterized in that the two winding elements of the sensing winding are wound in one-to-one correspondence with the third and fourth winding frames.